No idea what brand they really are under the skin, but Discmakers Printable Ultra & Premium grade CDs are now my top choice. I buy in bulk from them now, and use their stuff in my duplicators and one-offs.

They are hands-down the best I've ever used; next to ZERO failures or client returns. Every finnicky or balky machine (including one of my live CDr machines) performs better with these discs. I was about to replace one machine outright due to burn failures, but gave the new discs a try, and again: zero failures or errors.